Four solar flares from four different regions and X1 flare culminates the solar activity on 30 June 2026

ATel #17861; Costantino Sigismondi
on 30 Jun 2026; 23:54 UT
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Credential Certification: Costantino Sigismondi (sigismondi@icra.it)

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Four solar flares from four different regions and X1 flare culminates the solar activity on 30 June 2026 The solar activity in the last 48 hours has been characterized by several flares from different active regions. A similar situation occurred on 3 November 2025 when the superflaring region AR 4274 started with an M5 flare (ATel #17494). From 12:30 to 13:30 UT of 30 June 2026 four consecutive flares, reliably sympathetic, involved the active regions no. 4478, 4480, 4475 (M5.8, long duration event) and 4479 ( https://youtube.com/shorts/0gf9btA-KOg from Kanzelhohe Observatory). AR 4478 and 4479 are classified as Beta-Gamma-Delta region, the former active since 23 June, the latter has been more active since the end of 28 June, but its predominance was in competition with AR 4475 (near the same solar longitude of ATel #17851). The region AR 4478 is Southern and it has reached, on 30 June, the significant dimension of 1300 millionth of solar hemisphere, becoming one of the largest of the present solar cycle, but since 23 June to 30 June its 22 flares are all of C class, topping with C9.1 at 19:58 of 30 June. This triggered the X1.1 flare at 21:00 UT on AR 4479 at the Northern hemisphere. The two regions AR 4478 and 4479 appear to be sympathetic. In the sequence of flares of AR 4479 the most relevant are: 28 June C8.7 at 21:59 UT, 29 June C8.1 (long duration event) at 8:28 UT, M1.4 at 21:40 and M1.3 (1F optical importance) at 13:36 UT of 30 June, during the M5.8 of AR 4475 and X1.1 at 21:00 UT. If the region AR 4479 predominates for 3 days (ATel #17852) the flare X1.1 can be its strongest one, but the sympatheticity with AR 4478 may activate new strong flares on it.

X-rays from GOES and LMSAL data of 30 June 2026 (PDF)